JPH0548668A - Equipment for transmitting compulsory rate conversion modem - Google Patents

Abstract

PURPOSE:To simplify the electronic circuit of a data collecting device by executing serial data processing where transfer rates are different by means of the MODEM transmission of the fixed rate. CONSTITUTION:The data line of a designated data equipments 19 is connected to a change-over switch element 13. Serial data of the data equipments 19 is changed into serial data of a TTL level by a corresponding level converting circuit 12 through a serial data line 18 and inputted in a MODEM element 14 with the change-over switch 13 through a transistor logic TTL level serial data line 15. It is transmitted to a hostocomputer 21 by way of a transmission line 17 after MODEM-modulated. Even if the transfer rates of the designated data equipments 19 are different, the MODEM element 14 is made to meet the data equipment 19 having the highest transfer rate so that transfer rate conversion processing corresponding to information on the transfer rate of the data equipment 19 which is designated by the hostcomputer 21 is processed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forced rate conversion modem transmission device using an electronic circuit for handling serial data having different transfer rates.

[0002]

2. Description of the Related Art Conventionally, in a forced rate conversion modem transmission device of this type, a UART (Universal Asynchronous Rec) is used.
Serial / parallel conversion is performed using an eive transmitter) element or the like, and parallel data is input as a modem for modem transmission, or serial data is rate converted and then modem input for modem transmission.

[0003]

However, in the above-mentioned conventional forced rate conversion modem transmission device, when there are various transfer rates of serial data, a UART element is prepared in accordance with each transfer rate, or a rate conversion element is used. There is a problem in that the device must be prepared and the device becomes complicated. The present invention solves such a conventional problem, and an object of the present invention is to provide a forced rate conversion modem transmission device capable of simplifying conversion of a transfer rate.

[0004]

In order to achieve the above object, the present invention uses a modem element having the same transfer rate as the highest transfer rate of serial data to be handled, and serial data having a low transfer rate is modulated at a high transfer rate. It is designed to perform modem transmission in the form of multiplying.

[0005]

Therefore, according to the present invention, the electronic circuit of the data collecting apparatus can be simplified by performing the serial data of different transfer rates by the modem transmission of the fixed rate.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, 11 is a microprocessor, 12 is a level conversion circuit, 13 is a changeover switch element, 14 is a modem element, 15 is a TTL (Tranistor Transistor Logic) level serial data line, 16 is a changeover switch control line, and 17 is a transmission line. , 18 is a serial data line, 19 is a data device, 20 is a microprocessor 11, a level conversion circuit 12, and a changeover switch 13.
A data collecting device 21 including a modem element 14 and a host computer 21. FIG. 2 is a diagram showing the relationship between serial data and modem modulation. In FIG. 2, 101 is logic level serial data with a high transfer rate, 102
Is an example of modem modulation data of serial data 101, 103 is logic level serial data at medium transfer rate, 104 is
Is an example of modem modulation data of serial data 103, 105 is logic level serial data at a low transfer rate, 106
Is an example of modem modulation data of serial data 105.

Next, the operation of the above embodiment will be described with reference to FIGS. 1 and 2. In the above embodiment, the communication for designating the data device 19 is performed between the host computer 21 and the microprocessor 11 of the data collection device 20,
The microprocessor 11 connects the changeover switch 13 with the data line of the designated data device 19 by the changeover switch control line 16. The serial data of the connected data device 19 is converted into the TTL level serial data by the corresponding level conversion circuit 12 through the serial data line 18, and is input to the modem element 14 through the changeover switch 13 and the TTL level serial data line 15. After being modulated by the modem, it is transmitted to the host computer 21 via the transmission line 17. Even if the transfer rate of the designated data device 19 is different, the modem device 14 of the data level 19 having the highest transfer rate allows the modem modulation data 102 of the logic level serial data 101 of the high transfer rate. It is also possible to perform logic level serial data with medium transfer rate.
103 and the modem modulation data 104 and 106 of the logic level serial data 105 of the low transfer rate can be surely performed, and the transfer rate conversion processing corresponding to the transfer rate information of the data device 19 designated by the host computer 21 can be performed. The electronic circuit of the data collection device 20 can be simplified and the reliability of data transmission can be improved.

[0008]

As apparent from the above embodiment, the present invention has the effect that the electronic circuit of the data collecting device can be simplified by transmitting the serial data having different transfer rates by the fixed rate modem transmission. Have.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a data collection device according to an embodiment of the present invention.

FIG. 2 is a diagram showing the relationship between logic level serial data and modem modulation according to the present invention.

[Explanation of symbols]

11 ... Microprocessor, 12 ... Level conversion circuit, 13
… Changeover switch element, 14… Modem element, 15… TTL level serial data line, 16… Changeover switch control line,
17 ... Transmission line, 18 ... Serial data line, 19 ... Data device, 20 ... Data collecting device, 21 ... Host computer, 101 ... Logic level serial data at high transfer rate, 102 ... Modem modulation data of serial data 101, 103 … Moderate transfer rate logic level serial data, 104… Serial data 103 modem modulation data, 105… Slow transfer rate logic level serial data, 106… Serial data 105 modem modulation data.

Claims (1)

[Claims] 1. A data collecting device having an interface for inputting / outputting serial data, wherein serial data having different transfer rates are directly input to a fixed rate modem,
A forced rate conversion modem transmission device characterized by performing modem transmission and demodulating the transfer rate on the host computer side.